Adjustable eccentric chuck



Mb, I13 951 5. c. HAYNOSCI-Ji 2,541,054

ADJUSTABLE ECCENTRIC CHUCK Filed Oct. 14, 194'. 2 Sheets-Sheet l INVENTOR. Srmam 6". HA YNOSCH Feb. 13, 1951 s, c HAYNOSCH 2,541,054

ADJUSTABLE ECCENTRIC CHUCK Filed Oct. 14, 1947 2 Sheets-Sheet 2 INVENT STEPHEN GHA OSCH Patented Feb. 13, 1951 UNITED STATES PATENT OFFICE ADJUSTABLE ECCENTRIG CHUCK Stephen C. Haynosch, Cleveland, Ohio Application October 14, 1947, Serial No. 779,766

This invention relates to chucks and particularly to eccentric chucks.

The primary object of this invention is to provide an adjustable eccentric chuck for boring cutters that can be adapted to bore holes of various diameters with the same cutter.

Another object is to provide an adjustable eccentric chuck constructed to support a boring cutter in adjusted positions with substantially the same rigidity as if it were supported by a one-piece chuck.

A further object is to provide a device of the type stated that is simple and economical of construction; and also easy to maintain in accurate working condition.

These and other objects of the invention will become apparent from a reading of the following specification and claims, together with the accompanying drawings in which like parts are referred to and indicated by like reference characters and wherein:

Figure 1 is a front elevation of the adjustable eccentric chuck constituting this invention, with parts broken away;

Figure 2 is a rear elevation of the same with portions broken away;

Figure 3 is a left end view of the chuck in its extreme eccentric condition;

Figure 4 is an exploded view of the device;

Figure 5 is a vertical sectional view taken substantially along the line and in the direction of the arrows 5-5 of the Figure 1;

Figure 6 is a vertical sectional view taken substantially along the line and in the direction of the arrows 66 of the Figure 3;

Figure '7 is a cross sectional view taken along the line and in the direction of the arrows '|--'l of the Figure 1;

Figure 8 is a cross sectional view taken along the line and in the direction of the arrows 8-8 of the Figure 1; and

Figure 9 is a cross sectional view taken along the line and in the direction of the arrows 9-9 of the Figure 1.

Adjustable eccentric chucks are old in the art, but difficulty has been found in constructing these devices so that they will combine precision in working to close dimensions with simplicity of structure and consequent low cost.

The present invention is designed to be made from cylindrical bar stock and except for the guideways requires only simple turning, facing and threading operations in its construction.

The chuck as illustrated in the Figure 1 of the drawings is composed of three major parts or 2 Claims. (01. 279-6) members, a body, a tool holder and a collar, broadly indicated by the reference characters I0, 20 and 30 respectively.

The body member I0 is provided with a cylindrical shank portion H adapted to accurately fit the opening of a standard size tail stock or socket I! of a machine tool. When so positioned in a machine tool, the shank ll serves as the axis of rotation of the device. The body is also provided with an annular shoulder flange l5 and a threaded cylindrical neck l6 which are concentric with the longitudinal axis of the body member as is shown most clearly in the Figure 4. A tongue l2 extends transversely of the longitudinal axis of the body member. The tongue shown is T-shaped in cross section, although any other suitable shape such as a clove tail may be used if desired. Reference character It indicates a threaded hole which extends longitudinally of the tongue I2 as shown in the Figures 3, 4, 5, 6 and 9.

The tool holder 2!] is also cylindrical in shape and has a tool holding means or socket 2|, including a set screw 22, of conventional type for holding a boring cutter 40 as shown.

A groove 23 of a T-shaped configuration matching that of the tongue I 2 extends transversely of the longitudinal axis of the tool holder 20 and slidably engages the tongue 12 in an accurate fit. A screw 26 is seated in the bearing block 21' in threaded engagement with the hole M of the tongue l2 as shown in the Figures 1, 2, 3, 4, 5, 6 and 9. The tool holder has a plane bearing surface 25.

An annular threaded collar 30 and a bearing washer 32 are mounted on the threaded neck l6 between the bearing surface 25 and the body flange Hi.

When the body H1 and tool-holder 29 are concentrically aligned as designated by the reference character 20a in the Figures 3 and 5, the boring cutter 40a will cut a hole of minimum diameter. The tool holder may be moved into the eccentric position designated by the reference character 20 by inserting a socket wrench into the socket 28 at the outer end of the screw 26 and rotating the screw. This causes the tool holder to slide longitudinally of the tongue i2. This motion carries the boring cutter to a position designated by reference characters 40, which is eccentric of the axis of the body shank l I. The boring cutter will then describe a circle of larger diameter and therefore cut a larger hole. The radial movement of the tool holder 20 can be accurately determined by any one of a number of well known means. A screw with forty threads to the inch and carrying a circular scale divided into twentyfive parts will give readings in /1000 of an inch.

Once the tool holder has been located, the

threaded collar 3!] is screwed up tightly against turn of the collar 38 is requiredrtoeither-lock.

or unlock the tool holder 20. This makes a rigid unit of the device regardless of the-extentof the eccentricity of the setting ofathe; boringe cutterr Since the collar is circular, the locking pressure is exerted evenly and positively against the bearingsurface 25. There is no danger of loosening or. misalignmentoithe parts asin the case wher e a number:ofindividuallocking screwshave tobe drawn up evenly to assure that the setting or the boringcutter will zbe, maintained.

The-chuck canbexused toholdcutters of-v any typQ-thatmust be adjustably ofisct with-respect'to the rotational axis'of thebody member,

Itswillznew be clear that: there has been pro* vided: a :device that accomplishes the objectives heretoforesetforthr While the inventionhas been disclosed mats-preferred form, it is to be understo-odthat thespecific embodiment thereof asedescribedand illustrated herein is, not-to-be considered in a limited sense-as there-may be other forms or modificationsof the invention which should also be construedtocome within the scope of: the appendedclaims.

I claim:

1.-; Anadjustable eccentricchuck, comprising in combinatioma body member including a, shank mountable in a machine and havinge T-shaped tongueextending transversely of. the axis ,ofthe surface, and Jengageable.

said body, and flange and threaded neck portions concentric with the said axis, a tool holder in cluding means for holding a cutter and having a bearing surface, a groove portion slidably engaged with the said T-shaped tongue and a threaded means capable of moving the said tool holder longitudinally of the said tongue, and a threaded collar rotatably mounted on the threaded neck portion, intermediate the said flange and bearing with the saidg, bearing surface.

2. An adjustable eccentric chuck, comprising in combination, a body member including a shank mountable in-.a machine and having a dove tail shaped tongue extending transversely of the axis of'the said body, and flange and threaded neck portions, concentric; with the said axis, a tool holder including means for holding a. cutter and having a bearing surface, a groove portion slidably engaged with the said dove tail shaped on end. 1 e lnie ded means anablepi mo ing the said tool holder longitudinally-of the saigi tongue, and a threaded collar ,rotata-bly mounted on the threaded neck portion, intermediatethe said :flange and bearing surface, and en a eablc with the said bearing surface.

STEPHEN .C-. HAYNQSQBL REFERENCES CITED;

The following references are of record in the file of this patent:

UNITED STATES. PATENTS Number Name Date;

892,894 Roman July 751908 9713,5142" Muehlmatti Oct. 25', 1910' 1,825,046 3 Browand Sept. 29.,- 1931 1,960,124 Russell; M32Y122;1?19324 2,362,869 Jewell' Nov.-24,- 1942 2,l03,-336w Brown July 2; 1946 2,438,607 Jackson Mar. 30,1948 

